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<b>let </b><font color="Maroon" title="c1">X</font> be    <a href="struct_0.html#L1" title="STRUCT_0:struct.1">1-sorted</a> ;<br/>

<b>assume </b><a NAME="E1:5_1_1"/><i><font color="Green" title="E3">A1</font></i>: 
<font color="Maroon" title="c1">X</font> is <a href="monoid_0.html#V2" title="MONOID_0:attr.2">constituted-FinSeqs</a>
 ;<br/>

<b>let </b><font color="Maroon" title="c2">a</font> be    <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of <font color="Maroon">H<sub>1</sub></font>(<font color="Maroon" title="c1">X</font>); <i><font color="Red">:: according to </font></i><a class="ref" href="monoid_0.html#D1" target="_self" title="MONOID_0:def.1">MONOID_0:def 1</a><br/>

<b>thus </b><a NAME="E2:5_1_1"/>
<font color="Maroon" title="c2">a</font> is   <a href="funct_1.html#NM1" title="FUNCT_1:NM.1">Function</a>
 <b>by </b><i><a class="txt" href="monoid_0.html#E1:5_1_1"><i><font color="Green" title="E3">A1</font></i></a>, <a class="ref" href="monoid_0.html#D2" target="_self" title="MONOID_0:def.2">Def2</a></i>;<br/>


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